Electrode end cap



March 30 9 E. KLEINMANN ELECTRODE ENE, CAP

Filed April 1925 //v ve /v ra/2 fen/5r KL E/NMANN awns Patented Mar. 30, 1926.

UNITED STATES- ERNST KLEINMANN, DIP-BERLIN, GERMANY.

ELECTRODE END CA1.

Application filed April 20, 1925. Serial No. 24,617.

To all whom it-maq concern Be it known that I, ERNST :KLEINMANN, a citizen of Germany, residing. at Berlin, Germany, have invented new and useful Elecfitrode End Caps, of. whichthe following is a specification.

This invention relates to electrode endcaps such as are used to close the ends for example of carbon-electrodes and whether or not they are provided with terminals.

The invention is-an improvement on such electrode end caps and its main object is to prevent the caps tearing when being drawn over the electrode. Itis known that especially carbon electrodes of nominally .the same thickness vary in diameter within considerable limits, and sincethe end caps must be. made of a somewhat smaller diameter, they have to be'applied very firmly in order to fit and securely hold the electrode.' Thus they'are apt to tear when drawn over the electrode, the crack begin-.

- ning at the edge and, continuing into the material, renders the captuseless. Flaring the end of the cap to facilitate introduction has not been sufficient to overcome the difficulty.

The said disadvantages 'of the ordinary cylindrical cap, however, are overcome by the invention which conslsts 1n the provision of an electrode end cap of-which' the 1 open end is formed into an extended flange. This flange permits of an easy application of the-cap and prevents the edge tearingout, so that the caps may be'made of considerably thinner material than hitherto without risk of waste.

, According to the invention the extended flange of 'the cap may have any suitable or convenientform or angle; it may simply be funnel-shaped or provided with a bor- .dered edge which latter, forming a strong ridge around the open end, materially adds to the strength of the cap. V The accompanying sheet of drawings illustrates several modifications of the invention by wayof example. In all views'the caps are shown as applied to electrodes.

Fig-1 is a cross section through an improved end cap having a straight conical flange. t p

Fig. 2 is a similar view of a similar cap having a bordered edge.

Fig. 3 is-a similar view of a cap having a curved funnel shaped flange.

a bordered edge f. In this type of cap than hitherto usual.

Fig. 4 is apart-sectional elevation ofa terminal cap. y

In all these figures the letter a is used to denote the carbon electrodes and b the caps, the open ends of which are flanged in various ways. In Fig. 1 the shape ofthe extended flange is that of a straight cone 0 which, in Fig. 2, is provided with a bordered edge 01, which imparts an increased amount of strength and rigidity to the as whole cap. At a, Fig. 3, the flange is shown I to be of curved formation.

The extended flange of the terminal cap as shown-in Fig. 4 is likewise provided with strength and rigidity is of even greater importance than in the ordinary electrode cap, because of the provision of the terminal which, in use, is subjected to considerable handling. Hitherto these caps were usually made with one or more slits for the purpose of easier application and of obtalning a resilient grip on the electrode, so that the same cap may be used for electrodes of nominally the same diameter but which, as mentioned above, always differ to some extent. These slits, however, had the disadvantage that a, secure hold on the electrode was practically impossible, so that the cap was always apt to turn when thenut was fastened down on the terminal. It is evident,'that a non-slotted cap will give a better fit and may even be much shorter than a slotted cap of the same diameter.

All the modifications shown in the drawings have in .common that the place 'of contact 9 with the carbon electrode lies abovethe open end of the cap. Thustthe expanding forces which tend to provoke. a tearing-out of the edge are transferred fro the edge to a part of greater resistance)- i. e. to' that portion of the cap where theextended flange passes into the cylindrical shapeof the body. On-account of this design it is possible. to. use a material for the. 5 9 caps which may be up to per eentthi'nner Furthermore, the effective diameter of the caps may be made comparatively small, with the advantage, that thesame size of caps can be fitted over 105 all electrodes of nominally the same thickness.

-What- I claim is 1. As a new article of manufacture, an expansille cap for electrodes, comprising an 110 unbroken cylindrical body open at one end ;,and closed at the other, the open end of the body terminating in a downwardly and-out Wardly extending flan ge, the cap being of 5 less diameter than that of the electrode with which it is to be used, whereby provision is made for facilitating the applieation of the cap to the electrode and without splitting the cap and when applied will be held on 10 the electrode by friction.

2. As a new article of manufacture, a cap for electrodes comprising a cylindrical body open at one end and closed at the other, the open end of the body being provided with a. downwardly and outwardly extending 15 'flange terminating in a bordered rim as and for the purpose set forth.

7 In witness whereof I affix my signature.

ERNST KLEINMANN. 

